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Finding the Fourth Proportional to 1,391.56, 2,081.94 and 957.40

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Solution

The fourth proportional to 1,391.56, 2,081.94 and 957.40 is: 1,432.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.56 : 2,081.94 = 957.40 : x
  2. Step 2: Convert to fraction form
    1,391.56/2,081.94 = 957.40/x
  3. Step 3: Cross multiply
    1,391.56x = 2,081.94 × 957.40
  4. Step 4: Simplify right side
    1,391.56x = 1,993,249.36
  5. Step 5: Solve for x
    x = 1,993,249.36/1,391.56
  6. Step 6: Final answer
    x = 1,432.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.